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US 9,000,732 B2Granted
Apparatus and method for managing battery pack based on degraded cell
AssigneeLG Chem, Ltd.
InventorCheol-Taek Kim
Life of this patent
Estimating the term…
Abstract
The present invention discloses an apparatus for managing a battery pack by reflecting a degradation degree of secondary cells, selecting the secondary cell having a maximum disparate voltage value among calculated disparate voltage values as a degraded cell in the current charging cycle, and updating the information on the degraded cell.
Claims15
An apparatus for managing a battery pack having secondary cells, the apparatus comprising:
- a voltage sensing unit configured to measure voltage values of the secondary cells;
- a first monitoring unit configured to store a plurality of first voltage values each corresponding to one of the secondary cells measured when all the voltage values of the secondary cells are greater than or equal to a minimum reference voltage value in a charging cycle;
- a second monitoring unit configured to store a plurality of second voltage values each corresponding to one of the secondary cells when the voltage value of one cell among the secondary cells is greater than or equal to a maximum reference voltage value in the charging cycle;
- and
- a controlling unit configured to calculate a plurality of voltage disparate values, each value being a difference between the first voltage value and the second voltage value for each cell, determine a secondary cell having a maximum voltage disparate value among the plurality of voltage disparate values as a degraded cell in the charging cycle and manage the battery pack based on the degraded cell.
2 more elements
A method for managing a battery pack having secondary cells, the method comprising the steps of:
- (a) measuring voltage values of the secondary cells;
- (b) storing a plurality of first voltage values each corresponding to one of the secondary cells measured when all the voltage values of the plurality of secondary cells are greater than or equal to a minimum reference voltage in a charging cycle;
- (c) storing a plurality of second voltage values each corresponding to one of the secondary cells measured when the voltage value of one cell among the secondary cells is greater than or equal to a maximum reference voltage value in the charging cycle;
- (d) calculating a plurality of voltage disparate values, each value being a difference between the first voltage value and the second voltage value for each cell;
- and
- (e) determining a secondary cell having a maximum voltage disparate value among the plurality of voltage disparate values as a degraded cell in the charging cycle and managing the battery pack based on the degraded cell.
3 more elements
A battery pack comprising:
- a plurality of secondary cells;
- a voltage sensing unit configured to measure voltage values of the secondary cells;
- a first monitoring unit configured to store a plurality of first voltage values each corresponding to one of the secondary cells measured when all the voltage values of the secondary cells are greater than or equal to a minimum reference voltage value in a charging cycle;
- a second monitoring unit configured to store a plurality of second voltage values each corresponding to one of the secondary cells measured when the voltage value of one cell among the secondary cells is greater than or equal to a maximum reference voltage value in the charging cycle;
- and
- a controlling unit configured to calculate a plurality of voltage disparate values, each value a difference between the first voltage value and the second voltage value for each cell, determine a secondary cell having a maximum voltage disparate value among the plurality of voltage disparate values as a degraded cell in the charging cycle, and manage the battery pack based on the degraded cell.
3 more elements
Dependencies are inferred from the claim text.